Its not the clock but the fancier who decides how many birds go on thr result,yes the electronic will time them in but its up to the fancier how many to put forward for the final result. We have a fancier in our club and when the printout comes from his ETS he will say just take the first two or three and then the 10th or so as it is my pool pigeon so dont start blaming the clocking system its all down to the fancier in the end.